1. Department of Environmental Geographical Science; University of Cape Town; Private Bag X3 Rondebosch 7701 South Africa
2. Department of Geography; University of Leicester; UK
3. Department of Geography; University of Sheffield; UK
4. Geography Department; University of Free State; Bloemfontein South Africa
5. School of Geography, Archaeology and Palaeoecology; Queen's University Belfast; Northern Ireland UK
6. Centre National de Recherche Scientifique, UMR 5554, Institut des Sciences de l'Evolution de Montpellier, Département Environnements; Université Montpellier 2; France